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Components of Net Periodic Benefit Cost
 9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost Components of Net Periodic Benefit Cost
Three Months Ended September 30,Nine Months Ended September 30,
(Dollar amounts in thousands)Pension BenefitsPost-Retirement
Health Benefits		Pension BenefitsPost-Retirement
Health Benefits
 20202019202020192020201920202019
Service cost$325 $304 $10 $9 $975 $913 $29 $26 
Interest cost779 866 32 36 2,337 2,599 94 109 
Expected return on plan assets(1,050)(896)— — (3,149)(2,689)— — 
Net amortization of prior service cost1 — — — 1 1 — — 
Net amortization of net (gain) loss492 389 — (4)1,476 1,168 — (12)
Net Periodic Benefit Cost$547 $663 $42 $41 $1,640 $1,992 $123 $123 
 
Employer Contributions
 
First Financial Corporation previously disclosed in its financial statements for the year ended December 31, 2019 that it expected to contribute $3.7 million and $736 thousand respectively to its Pension Plan and ESOP and $251 thousand to the Post Retirement Health Benefits Plan in 2020. Contributions of $3.0 million have been made to the Pension Plan thus far in 2020. Contributions of $176 thousand have been made through the first nine months of 2020 for the Post Retirement Health Benefits plan. No contributions have been made in 2020 for the ESOP. The Pension plan was frozen for most employees at the end of 2012 and for those employees there will be discretionary contributions to the ESOP plan and a 401K plan in place of the former Pension benefit. In the first nine months of 2020 and 2019 there has been $1.4 million and $1.1 million of expense accrued for potential contributions to these alternative retirement benefit options.